Step 1: The Clip
you need a length of wire a bit longer than the distance from the top eye to the reel clamp. I've used 2mm galvanised garden wire 1.5mm/16 swg is probably about as thin as you'd want to go wire coat hanger (not seen one in ages do they still make them) is probably a bit thick.
bend about 20mm \3/4" back on its self at each end. Make it a nice tight bend preferably touching at one end leave the other end as a more open loop.
bend the tight end around to form a hook that goes into the top eye of the rod. bend the more open loop end to form a hook that fits under the top reel clamp. tighten the clamp enough to hold the rod in its collapsed state.